I saw your game, ForrestI was screaming run forty-fourBut you kept running past the end zoneOh where'd you go ForrestForrest Gump

Literally referring to the part of the movie when Forrest caught the kickoff and ran a bee-line to the end-zone but proceeded past into the locker rooms

But, it also means that the guy he likes didn’t reciprocate the feelings Frank had. Frank is screaming for him, meaning he likes him and supports him. Frank is thinking of himself as the ‘score’, but the guy ran past the endzone. He had Frank, or had his heart, but he ran past it, ultimately rejecting him.